Tomb Raider I-III Remastered Starring Lara Croft

Here’s a very basic guide just to make sure you’re on the right track (count them as you break them):

BREAKABLE FLOORS (shown as total and how many are in each section in brackets, any that are harder to find have an explanation):

Caves: 2 (2). Encountered on main game route.
City of Vilcabamba: 14 (2+4+8). Encountered on main game route.
Lost Valley: 0
Tomb of Qualopec: 10 (1+1+8). The 8 is in the secret chamber behind the statue just before the Scion chamber. The others are on the main game route.
St Francis Folly: 1 (1). This is in the first secret chamber.
Colosseum: 0
Palace Midas: 4 (3+1). The 1 is in the secret chamber in the garden. The others are on the main game route.
Cistern: 5 (5). All at the end of the level in the checkered floor.
Tomb of Tihocan: 5 (5). All in the last secret chamber.
City of Khamoon: 0
Obelisk of Khamoon: 0
Sanctuary of the Scion: 0
Natla’s Mines: 1 (1). On top of the house.
Atlantis: 0
Great Pyramid: 9 (1+1+3+3+1). Encountered on main game route.